class B1{
  int n;
  static int sum=0;
  void setN(int n){
    this.n=n;
  }
  int getSum() {
    for(int i=1;i<=n;i++)
    sum=sum+i;
    return sum;
  }
}
public class A3_2 {
    public static void main (String args[]){
      B1 b1=new B1(),b2 = new B1();
      b1.setN(3);
      b2.setN(5);
      int s1=b1.getSum();
      int s2=b2.getSum();
      System.out.println(s1+s2);
    }
}
